The birth of Islam over fourteen centuries ago was a monumental event in human history with an everlasting effect on humanity. For centuries researchers contemplated on the growth and distribution of Muslims throughout the World. The purpose of this book is to present a reliable estimate of the World Muslim population since the inception of Islam at the start of the seventh century to the start of the twenty-fourth century.

In this book, the World is divided into five continents, each is divided into non-overlapping regions, and these in turn are divided into current countries. A centennial data estimate for each region and current country from 600AD to 2300AD (approximately 1H to 1700H) of the total population, and corresponding Muslim population and its percentage is provided. Furthermore, the same data in decennial order from 1790 to 2100 (or 1210H to 1520H) is provided for each region and country. These data are summarized to be a reference for other studies and discussions related to the Muslim population. The presented data show that the percentage of World Muslim population with respect to the total World population has increased steadily from 3% in 700AD or 100H to 7% in 800AD or 200H, to 11% in 900AD or 300H, to 13% in 1000AD to 1200AD (or 400H to 600H). Subsequently, this percentage continued to increase at less than one percentage point per century, reaching 16% in 1700AD or 1100H. But it dropped to 13% in 1800AD or 1200H, to increase to 14% in 1900AD or 1300H. This percentage has been increasing by one percentage point per decade since 1950AD or 1370H, reaching 25% in 2020AD or 1440H. The rate of increase of the World Muslim population is expected to slow down, increasing their percentage to 28% by 2050AD or 1470H, to 32% by 2100AD or 1520H, to 33% by 2200AD or 1630H, then to 35% by 2300AD or 1730H.